add inspect_tagmap.md

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diff --git a/example/inspect_tagmap.md b/example/inspect_tagmap.md
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+To inspect the [`tagmap`][1] table using human readable values:
+
+[1]: internal_tables.md
+
+```
+SELECT cards.name,tags.name
+FROM tagmap
+INNER JOIN cards
+ON tagmap.card = cards.id
+INNER JOIN tags
+ON tagmap.tag = tags.id
+```